diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 00000000000..62ff45c1982
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1,6 @@
+# This file is for the version management tool "asdf".
+# mms uses it as well.
+
+# This Node.js version matches the one required in
+# the "engines" in the package.json.
+nodejs 22.15.1